We selected DER-430 Reference design, which is 7.8W LED Driver designed using LYT2004D with Input range - 90-270VAC and Output voltage 62VDC/ 130mA.
We designed transformer using EE-16 core [Ballasat-CC]. By only replacing transformer in DER-430 board, turn on LED driver with no-load gives output voltage 93VDC, With preload resistor 1ME. And by connecting LED load, with input 60VAC Driver output is blinking but input higher than 170VAC, driver gives constant output voltage 56VDC and current 30mA,after few minutes the device LYT2004D failed, input fuse burnt.
LED Board details- 20 LEDS of VF=3.1V/IF=150mA is connected in series.
Driver o/p= 20x3.1= 62VDC
Driver output current = 130mA
Transformer design spread sheet is attached to the post for your reference.
We use input bulk capacitors C1 and C2 10uF/450V, not used inductors L1, L2 and hence not placed resistor R1 and R2.
We need your kind support to sort out the problem.
Thanks and Regards,